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Computer-Aided Ergonomic Design and Assembly of a Domestic String Hopper Machine
Published in Kaushik Kumar, Sridhar B. Babu, Industrial Automation and Robotics, 2023
C. Vigneswaran, G. Madhan Mohan, M. Vignesh Raja, E. Selva Vignesh
The computer-aided 3D modeling was performed using CREO 5.0. The parts were designed using the top-down approach. In the CREO assembly, the complete assembly of the machine is imported. A 50th percentile manikin is imported into the CREO assembly. The product is assumed to be placed at a height of 80 centimeters from the floor level. The manikin is supposed to stand in front of the machine and operate it. In this regard, a hypothetical plan was constructed wherein the imported manikin was made to stand at a distance of 80 centimeters to act as a datum. The manikin was controlled by making it stand up on the floor plan and facing orientation with other available plans. Hands and head positions are adjusted to represent the actual working posture of the user. The user's arm would neither be supported nor would the user lean. The user's arm was assumed to be in a standing position and would not be working across the midline or outside the body. The user's trunk as well as his/her legs and feet would be well supported and balanced. The posture would not be static. The user's load should not exceed more than 2 kg.
Quantifying osteosynthesis plate prominence – mathematical definitions and case study on a clavicle plate
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2023
Martin Zenker, Evangelos Theodorou, Daniel Andermatt, Ralf Winkler, Harry A. Hoyen, Martin Jaeger, Chunyan Jiang, Simon Lambert, Stefaan Nijs, Arabella D. Fontana
Two designs of the DePuy Synthes clavicle plates were selected: the DePuy Synthes 3.5 mm LCP® Superior Clavicle Plate, 7-hole, right (article nr. 02.112.082) and the DePuy Synthes 3.5 mm LCP® Superior-Anterior Clavicle Plate, 7-hole, right (article nr. 02.112.028). Two designs of the same plate (i.e. two plates with same profile but different shape) from the same manufacturer were chosen for this analysis to represent two design options during development and to showcase how the proposed methodology can be used to compare these candidates. The same plate length (i.e. 7 holes) was chosen for both designs for fair comparison between designs, since both plates can be used for the same type of fractures and/or technique. 3 D models of these plates were provided by the manufacturer for the analysis. Using a computer aided design software (CREO Parametric V5.0, PTC Inc., Needham, MA, USA), the thread of the screw holes was suppressed and high quality stereolithography (STL) files were generated for the digital analysis.
Data transfer analysis of the homogeneous rough surface of a solid model into a CAE system with varying file data formats
Published in Cogent Engineering, 2022
K. Kartini, G.A. Sipayung, R. Ismail, J. Jamari, A.P. Bayuseno
The first option for CAD data exchange relates to the direct model translation, for which the data file stored in a product database can translate directly in one step from any CAD system format to others. Typically, a neutral database may translate data directly and its structure must be universal, generated by the least prerequisite designations of varying modeling data, and be the impartial format of supplier software (Xu, 2009). In this case, using options such as File Open and File Save As can read and/or write other CAD systems such as SolidWorks, PTC Creo, Siemens NX, and CATIA (Chang, 2014). However, this choice is often restricted because most CAD formats are privately owned by suppliers. Accordingly, these direct translators may have unidirectional, partially functional, and un-standardized CAD formats (Choi et al., 2002; Kim et al., 2019)
Thermal analysis of intraocular electronic display projector visual prosthesis
Published in Numerical Heat Transfer, Part A: Applications, 2020
D. Gongal, S. Thakur, A. Panse, R. Pawar, C. Q. Yu, C. D. Foster
An anatomically accurate three-dimensional model of the human eye was created following dimensions given in the Atlas of the Human Eye [22] supplemented by data provided by US Army Research Laboratory [23] where measurements were not available. The geometry was created on Creo Parametric for analysis. For simplicity in modeling and analysis, zonule fibers were modeled as one single lumped mass attached to the ciliary body and lens. Due to the lack of accurate iris dimensions in existing research, the design was approximated based on Li and Huang [24]. The aqueous and vitreous humors were designed by filling the void space left by the tissues. The Optic Nerve Head (ONH) was modeled as a cut at the posterior end at a 10° offset from the optical axis. The size of the eye was 24.79 mm along anterior-posterior direction and 24 mm in transverse and vertical directions.